JP2003078359A - Amplifying equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide small-sized and lightweight amplifying equipment at a low cost which improves performance of distortion compensation. SOLUTION: In a digital orthogonal modulator 102, an input signal is subjected to digital orthogonal modulation by using an IF, the signal is divided into a main signal system and a control system after offset rotation processing, and outputted, and a power value is detected in an IF band by a power detecting part 107 of the control system. As a result, the offset rotation processing of the input signal in power detection is made unnecessary, and constitution for phase synchronization of a multicarrier signal and a power value signal is unnecessary, so that the performance of distortion compensation can be improved without using a delay line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system such as a mobile phone, and more particularly to an amplifying device used in a base station device.

[0002]

2. Description of the Related Art In a mobile communication system such as a mobile phone, a base station apparatus needs to make a radio signal reach a mobile station apparatus which is physically far away. ), It is necessary to greatly amplify and transmit output. In the above mobile communication system, W
-CDMA (Wide-band Code Division Multiple Acces)
s: wideband code division multiple access) is adopted as a mobile communication system.

However, since the amplifier is an analog device, its input / output characteristic is a non-linear function. In particular, after the amplification limit point called the saturation point, the output power becomes almost constant even if the power input to the amplifier increases.

Then, this non-linear output causes non-linear distortion. In the transmission signal before amplification, the signal component outside the desired signal band is suppressed to a low level by the band limiting filter, but nonlinear distortion occurs in the signal after passing through the amplifier, and the signal component outside the desired signal band (adjacent channel) Leak. This causes a phenomenon that the power spectrum extends to the adjacent channel.

Since the base station apparatus has high transmission power as described above, the magnitude of such leakage power to the adjacent channel is strictly regulated, and for this reason, such adjacent channel leakage power (ACP: ACP: Adjacent Channel
The major issue is how to reduce leak power).

Conventionally, as a device for amplifying transmission power while reducing adjacent channel leakage power as described above, a base station apparatus is equipped with a distortion compensation amplification apparatus using a predistortion technique and is used for amplification of transmission power. There is.

The structure of a conventional distortion compensation amplifier using the predistortion technique will be described with reference to FIG. FIG. 3 is a configuration block diagram of a distortion compensation amplification device using a conventional predistortion technique. In FIG. 3, an input signal, which is digital data and is a baseband signal of each carrier of a multicarrier signal, is converted into an analog signal by a D / A converter 201, and the quadrature modulator 20.
2 is quadrature modulated.

The quadrature-modulated input signal has an RF frequency (Ra
dio Frequency: Radio frequency) is up-converted. In FIG. 3, the up-conversion is specifically based on the carrier frequency output from the oscillator 203,
Frequency conversion of the input signal is performed in the mixer 204,
Further, necessary band limitation is performed by using a band limitation filter (not shown) or the like.

In FIG. 3, the oscillator 203 and the mixer 2 are shown.
04 is provided for each carrier of the input signal, and up-conversion is performed for each carrier. The output of mixer 204 for each carrier is combined by combiner 205 to form a multi-carrier signal.

The multicarrier signal output from the combiner 205 is distributed by the distributor 206, one of which is the delay line 208.
The other is input to the power detector 207. The power detector 207 detects the power value of the input multi-carrier signal using, for example, envelope detection. In addition, the delay line 208 delays the input multi-carrier signal for a fixed time and outputs it.

The multi-carrier signal output from the delay line 208 and the power value signal output from the power detector 207 are input to the predistorter 209. The predistorter 209 performs control for giving distortion compensation characteristics to the multicarrier signal.

The distortion compensation characteristic is an inverse characteristic to the non-linear characteristic in the amplitude-phase plane generated in the amplifier, and is generally AM-AM (amplitude-amplitude) conversion or AM-PM (amplitude-amplitude) conversion using the power of the input signal as an index. It is represented by an amplitude-phase) conversion.
In the amplification device of FIG. 3, the predistorter 209 is an amplifier (PA (Po
wer amplifier)) 210, the distortion compensation characteristic corresponding to the nonlinear characteristic is given.

Distortion occurs in the amplifier 210 when amplifying the transmission signal, but the pre-distorter 209 imparts distortion having a reverse characteristic of the nonlinear characteristic to the multicarrier signal input to the amplifier 210 in advance. Therefore, the amplifier 210 can output the amplified multicarrier signal without distortion, and the distortion is compensated. The multicarrier signal output from the amplifier 210 is distributed by the distributor 211, fed back to the predistorter 209, and used to specify a new distortion compensation characteristic.

[0014]

However, in the above-mentioned conventional amplifying device, since the input signal is delayed by using the analog delay line, the amplifying device becomes large and heavy, and the cost becomes high. Was there. Regarding this, by using a digital delay line instead of the delay line, performing power detection using a digital input signal, and by synchronizing the phases of the multicarrier signal and the power value signal,
It has been considered to obtain an amplifying device that does not use a delay line.

In the distortion compensation amplifier using the predistortion technique, it is necessary to match the phases of the multicarrier signal and the power value signal in the predistorter in order to give the distortion compensation characteristic to the input signal accurately. In order to detect the power value using the digital input signal as described above, it is necessary to adjust the frequency in consideration of the frequency difference of each carrier, and the phase of this operation and the conversion to the carrier frequency are matched. As a result, the phases of the multicarrier signal and the power value signal can be matched. However, in order to make the phases coincide with each other, it is required to control the phase with higher accuracy than that of the amplifying device of FIG. 3, but it is difficult to realize, and there has been a problem to improve the performance of distortion compensation.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an amplifying device which is small and lightweight, low in cost, and capable of improving distortion compensation performance.

[0017]

According to the present invention for solving the above-mentioned problems of the conventional example, in an amplifying apparatus, digital quadrature modulation means digitally quadrature modulates an input signal for each carrier to perform offset rotation processing. Then, a digital delay means for synthesizing with a coupling means and digitally delaying for a fixed time is used for the main signal system or the control system instead of the analog delay line,
Distortion compensator provides distortion compensation that cancels the non-linear characteristic generated in the amplifier by the power value and part of the output from the distributor with respect to the multi-carrier signal, does not require an analog delay line, and controls the main signal system. The phase control with the system can be performed by the digital quadrature modulation means, and it is possible to provide a small and lightweight device at low cost.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. The function realizing means described below may be any circuit or device as long as it can realize the function, and part or all of the function can be realized by software. is there. Further, the function realizing means may be realized by a plurality of circuits, or the plurality of function realizing means may be realized by a single circuit.

In the amplification device according to the embodiment of the present invention, the digital quadrature modulation means digitally quadrature modulates the input signal for each carrier, performs offset rotation processing, and synthesizes them by the coupling means to replace the analog delay line. In addition, a digital delay means for digitally delaying for a fixed time is used in the main signal system or the control system, and the distortion compensation means cancels the non-linear characteristic generated in the amplification means by the power value and a part of the output from the distribution means with respect to the multicarrier signal. Distortion compensation is provided, an analog delay line is not required, and phase control between the main signal system and the control system can be performed by digital quadrature modulation means, and it is possible to provide a compact, lightweight, low-cost device. is there.

In the claims, the digital quadrature modulation means is a digital quadrature modulator, the coupling means is a coupler, the digital delay means is a digital delay section, the digital / analog conversion means is a digital / analog converter, and the up conversion is performed. The means corresponds to the up-conversion unit, the power detection unit corresponds to the power detection unit, the amplification unit corresponds to the amplifier, the distribution unit corresponds to the distributor, and the distortion compensation unit corresponds to the predistorter.

The configuration of the amplification device according to the embodiment of the present invention will be described with reference to FIG. FIG. 1 is a configuration block diagram of a distortion compensation amplifier device according to an embodiment of the present invention. The amplifier device of FIG. 1 uses the predistortion technique as in the conventional case, and performs an amplification process on the input signal of each carrier which is a digital signal. Also,
Although the number of carriers is four in the distortion compensation amplification device of FIG. 1, the number of carriers of the input signal may be different.

The amplifying apparatus shown in FIG. 1 is a digital quadrature modulator 1
02, the coupler 105, the digital delay unit 112, and D
/ A converter (D / A in the figure) 101, up-conversion section 115, power detection section 107, predistorter 109, and amplifier (PA (Power Amplifier) in the figure)
It is composed of 110 and a distributor 111.

Further, the up-conversion unit 115 has a VC
It is composed of an O (Voltage Controlled Oscillator) 103 and a mixer 104. In the amplifying device of FIG. 1, the digital quadrature modulator 102 is provided for each carrier of the input signal.

The digital quadrature modulator 102 quadrature modulates an input signal which is a digital signal, and outputs it to the combiner 105. Further, in performing quadrature modulation, the digital quadrature modulator 102 performs offset rotation processing of the carrier frequency difference on the input signal of each carrier.

The combiner 105 is a digital quadrature modulator 10.
The input signals of the respective carriers output from 2 are combined to generate a multi-carrier signal, which is output to the digital delay unit 112 and the power detection unit 107.

The digital delay unit 112 digitally delays the multi-carrier signal for a predetermined time, and the D / A converter 101.
Output to. The digital delay unit 112 is configured using, for example, a memory buffer or the like.

The D / A converter 101 converts the multi-carrier signal, which is a digital signal, into an analog signal and outputs it to the up-conversion unit 115.

The up-converter 115 up-converts the multi-carrier signal into an RF frequency (Radio Frequency) and outputs it to the predistorter 109. The up-convert unit 115 has a VCO 10
3 and a mixer 104 are provided, the mixer 104 performs frequency conversion according to the carrier frequency output from the VCO 103, and then performs necessary band limitation using a band limiting filter (not shown).

The power detector 107 detects the power value by calculating the power value based on the input multi-carrier signal, and outputs the detected power value to the predistorter 109 as a power value signal.

The predistorter 109 controls the multicarrier signal input from the up-converter 115 to give distortion compensation characteristics, and outputs it to the PA 110. The predistorter 109, based on the power value signal output from the power detection unit 107 and the amplified multicarrier signal output from the distributor 111, with respect to the multicarrier signal input from the upconversion unit 115, A distortion compensation characteristic that cancels the nonlinear characteristic generated in the PA 110 is given.

The amplifier 110 amplifies and outputs the multicarrier signal. The distributor 111 distributes the amplified multi-carrier signal output from the amplifier 110, outputs it to the outside, and outputs it to the predistorter 109 as feedback.

Next, the structure of the predistorter 109 will be described with reference to FIG. FIG. 2 shows a predistorter 1 in the distortion compensation amplification device according to the embodiment of the present invention.
It is a configuration block diagram of 09. Predistorter 109
Is an attenuation control unit 121-1 and a phase control unit 121-2.
And D / A converters (D / A in the figure) 122-1 and 12
2-2, an attenuator 123, a phase shifter 124, a table generator 125, a VCO 126, a mixer 127, and L.
PF (Low Pass Filter) 128
And an A / D converter (A / D in the figure) 129. In FIG. 2, an attenuator 123 and a phase shifter 124
May be installed in a different order.

The attenuation control unit 121-1 internally stores an LUT (Look Up Table) which is a table showing the relationship between the power value and the attenuation amount reflecting the distortion compensation characteristic, and the input power value. The LUT is referred to based on the signal, and the attenuation control signal corresponding to the reference result is output to the D / A converter 122-1. The attenuation control unit 121-1 updates the LUT and adjusts the attenuation amount based on the control command from the table generation unit 125.

The phase controller 121-2 internally stores an LUT which is a table showing the relationship between the power value and the phase control amount reflecting the distortion compensation characteristic, and based on the input voltage value signal. The LUT is referred to and the phase control signal corresponding to the reference result is output to the D / A converter 122-2. Further, the attenuation control unit 121-2 updates the LUT and adjusts the phase control amount based on the control command from the table generation unit 125.

The D / A converters 122-1 and 122-2 convert the attenuation control signal output from the attenuation control unit 121-1 and the phase control signal output from the phase control unit 121-2 into analog signals, respectively. Attenuator 123 and phase shifter 12
Output to 4.

In the attenuator 123, the attenuation control signal output from the attenuation control section 121-1 is analog-converted by the D / A converter 122-1 and based on the signal, the input multicarrier signal is Attenuation processing corresponding to the distortion compensation characteristic is performed.

In the phase shifter 124, the phase control signal output from the phase control unit 121-2 is analog-converted by the D / A converter 122-2, and based on the signal, the input multicarrier signal is A phase control process corresponding to the distortion compensation characteristic is performed.

The table generation unit 125 outputs the amplifier 110, and based on the distortion component extracted from the amplified multi-carrier signal fed back by the distributor 111, the attenuation control unit 121-1 and the phase control unit 121-. A control command to update the LUT stored in 2 is output to the attenuation control unit 121-1 and the phase control unit 121-2, respectively.

Further, the table generating section 125 is provided with the VCO 12
A control signal is output to 6 to control the frequency for extracting the distortion component. In the predistorter of FIG. 2, the table generation unit 125 may be configured by using a DSP (Digital Signal Processor).

The VCO 126 outputs the frequency for extracting the distortion component to the mixer 127 based on the control signal output from the table generating section 125.

The mixer 127 applies V to the amplified multi-carrier signal fed back by the distributor 111.
Conversion to the frequency output from the CO 126 is performed.

When the amplified multi-carrier signal subjected to the frequency conversion passes, the LPF 128 attenuates the frequency component of a certain value or more and extracts the distortion component. In the predistorter of FIG. 2, BP is used instead of LPF128.
F (Band Pass Filter) may be used.

The A / D converter 129 digitally converts the distortion component extracted by the LPF 128 and outputs it as a digital signal to the table generator 125.

Next, the operation of the distortion compensation amplification device according to the embodiment of the present invention will be described with reference to FIGS. 1 and 2.
In the amplification device of FIG. 1, the input signal of each carrier is input to the corresponding digital quadrature modulator 102 for each carrier, and quadrature modulation is performed. The digital quadrature modulator 102 performs quadrature modulation using IF (Intermediate Frequency), and outputs the quadrature-modulated input signal, which is a digital IF signal, to the combiner 105.

In addition, the digital quadrature modulator 102
The carrier frequency is included in the digital IF signal of each carrier.
An offset rotation process of a number difference is performed. For example,
Rear carrier frequency is 2000MHz, 2005MH
z, 2010 MHz, 2015 MHz,
In the digital quadrature modulator corresponding to the carrier, IF is f
_IFThen, for each digital IF signal, f
_IFMHz, f_IF+ 5MHz, f_IF+ 10MHz,
f_IFIt gives an offset rotation of +15 MHz. Sanawa
In the digital quadrature modulator 102, in each carrier
Considering the carrier frequency difference, for the digital IF signal
Offset rotation processing is being performed.

The combiner 105 combines the input digital IF signals of the respective carriers to generate a multi-carrier signal, which is output to the digital delay section 112 and the power detection section 107. Hereinafter, in the amplification device of FIG. 1, a series of circuit groups from the digital quadrature modulator 102 to the D / A converter 101 will be referred to as a main signal system, and the power detection unit 307 will be referred to as a control system.

In the main signal system, the digital delay unit 112
The multi-carrier signal input to is delayed for a certain time by digital delay and then output to the D / A converter 101. The digital delay unit 112 corresponds to a conventional analog delay line, and the delay amount of the multicarrier signal is set so that the timings of the multicarrier signal and the power value signal in the predistorter 109 match. .

The multi-carrier signal is sent to the D / A converter 101.
Is converted into an analog signal and input to the up-conversion unit 115. Up-conversion unit 115
Is provided with a set of VCO 103 and mixer 104. The multi-carrier signal is converted to V by the mixer 104.
Conversion to the carrier frequency output from the CO 103 is performed and up-converted to the RF frequency. The multi-carrier signal up-converted by the up-converter 115 is output to the predistorter 109.

In the control system, the multi-carrier signal which is a digital IF signal is output to the power detection section 107. The power detection unit 107 detects the power value by calculating the power value based on the multicarrier signal. The power detection unit 107 outputs the detected power value to the predistorter 109 as a power value signal. In the power detection unit 107, for example, the power value can be calculated by squaring the voltage value of the multicarrier signal.

Further, the power detection unit 107 may be provided with a band limiting filter (not shown) to limit the band of the signal band to the calculation result as necessary and output the band limiting result as a power value. Good.

The multi-carrier signal output from the up-converter 115 and the power value signal output from the power detector 107 are input to the predistorter 109. The predistorter 109 performs control to give distortion compensation characteristics to the multicarrier signal based on the input power value signal.

The operation of the predistorter 109 will be described below with reference to FIG. As shown in FIG. 2, the power value signal is input to the attenuation control unit 121-1 and the phase control unit 121-2 in the predistorter 109. The attenuation control unit 121-1 and the phase control unit 121-2 respectively store an LUT indicating the relationship between the power value and the attenuation amount and an LUT indicating the relationship between the power value and the phase control amount. By referring to the LUT on the basis of the power value in each control unit, it is possible to specify the attenuation amount or the phase control amount that reflects the distortion compensation characteristic.

The attenuation control section 121-1 refers to the LUT on the basis of the input power value and specifies the corresponding attenuation amount, and then uses the attenuation amount as the attenuation control signal to the D / A converter 12.
Output to 2-1. The D / A converter 122-1 converts the attenuation control signal into an analog signal and outputs the analog signal to the attenuator 123. The attenuator 123 attenuates the multicarrier signal reflecting the distortion compensation characteristic based on the input attenuation control signal. Perform processing.

The phase control unit 121-2 refers to the LUT based on the input power value and specifies the corresponding phase control amount, and the phase control amount is sent to the D / A converter 122-2 as a phase control signal. Output. The D / A converter 122-2 converts the phase control signal into an analog signal and outputs it to the phase shifter 124. Based on the input phase control signal, the phase shifter 124 reflects the phase of the multicarrier signal reflecting the distortion compensation characteristic. Perform control processing.

The multicarrier signal to which the distortion compensation characteristic is given by the attenuation processing and the phase control processing is output to the amplifier 110. The amplifier 110 amplifies the input multi-carrier signal and outputs it to the outside.
Since the multi-carrier signal is given the distortion compensation characteristic having the inverse characteristic of the nonlinear characteristic generated in the amplifier 110,
The multi-carrier signal is theoretically amplified without distortion. The amplified multi-carrier signal is output to the outside and also output to the predistorter 109 by the distributor 111 as feedback.

In the amplifier 110, the nonlinear characteristics may change due to factors such as deterioration over time and temperature characteristics, and the distortion may not be compensated by the distortion compensation characteristics provided by the predistorter 109. Therefore, the predistorter 109 extracts the distortion component that remains uncompensated from the amplified multicarrier signal that has been fed back and corrects the distortion compensation characteristic based on the distortion component so as to adapt to the change in the nonlinear characteristic. I am in distortion.

The amplified multi-carrier signal fed back from the distributor 111 is input to the mixer 127 in the predistorter 109. Mixer 1
At 27, conversion to the frequency output from the VCO 126 is performed and output to the LPF 128. In LPF128,
With respect to the multi-carrier signal subjected to frequency conversion, the frequency component above a certain frequency is attenuated and the distortion component is extracted.
The extracted distortion component is an A / D converter 12 as a distortion component signal.
It is input to 9 and is digitally converted.

The digitally converted distortion component signal is input to the table generator 125. The table generation unit 125, based on the input distortion component signal, the attenuation control unit 121-
1 and the phase control unit 121-2, a control command to update the LUT stored in each control unit is output so as to reduce the distortion component.

Attenuation control section 121-1 and phase control section 121
-2 is the LUT based on the input control command
Is updated and the attenuation amount or the phase control amount is adjusted. After that,
In each control unit, the attenuation process and the phase control process of the multi-carrier signal are performed based on the updated LUT, and the distortion compensation characteristic adapted to the change of the nonlinear characteristic can be given.

Further, the table generation unit 125 uses the VCO1
A control signal is output to the V.sub.26, and the VCO 126 updates the frequency for extracting the distortion component according to the control signal.

The predistorter 109 of FIG. 2 performs an adaptive predistortion for extracting a distortion component, but as another adaptive predistortion, the table generating unit 125 uses the amplified multicarrier signal fed back. Demodulate and combiner 10
5 is compared with the multi-carrier signal output from No. 5, and the attenuation control unit 121-1 and the phase control unit 1 are arranged to minimize the error.
The LUT 21-2 may be updated.

In the amplifying apparatus of FIG. 1, if the predistorter 109 is not adaptive, that is, does not perform adaptive predistortion, and the feedback of the multicarrier signal is not necessary, the distributor 111 is not necessary.

The digital delay section 112 may be provided in either the main signal system or the control system as long as the signal to be handled is a digital signal. In particular, if the time required to output the multicarrier signal to the predistorter 109 in the main signal system is longer than the time required to detect the power value in the control system, the digital delay unit 112 should be provided in the control system. Is desirable.

According to the distortion compensating and amplifying apparatus according to the embodiment of the present invention, the digital quadrature modulator digitally quadrature-converts the input signal using the IF, performs the offset rotation processing, and then synthesizes it in the combiner 105, By outputting separately to the main signal system and the control system, and detecting the power value in the IF band in the power detection unit of the control system, the offset rotation processing of the input signal in the power detection becomes unnecessary, and the multicarrier signal There is no special need for a configuration for synchronizing the phase of the power value signal with the power value signal, and there is an effect that the performance of distortion compensation can be improved without using a delay line.

Further, since only one VCO 103 and one mixer 104 are required in the D / A converter 101 and the up-conversion unit 115, there is an effect that the circuit scale of the entire amplifying device can be reduced as compared with the conventional one.

[0066]

According to the present invention, the digital quadrature modulation means digitally quadrature modulates an input signal for each carrier, performs offset rotation processing, and synthesizes them by the coupling means. A digital delay means for digitally delaying is used in the main signal system or control system, and the distortion compensation means provides distortion compensation for the multicarrier signal by canceling the non-linear characteristic generated in the amplification means by the power value and a part of the output from the distribution means. Since the amplifier is used, the analog delay line is not required, and the phase control of the main signal system and the control system can be performed by the digital quadrature modulation means, and there is an effect that it is possible to provide a small and lightweight device at low cost.

[Brief description of drawings]

FIG. 1 is a configuration block diagram of a distortion compensation amplification device according to an embodiment of the present invention.

FIG. 2 is a configuration block diagram of a predistorter 109.

FIG. 3 is a configuration block diagram of a conventional distortion compensation amplification device.

[Description of Codes] 101, 201 ... D / A converter, 102 ... Digital quadrature modulator, 202 ... Quadrature modulator, 103, 126,
203 ... VCO, 104, 127, 204 ... Mixer,
105, 205 ... Combiner, 107 ... Power detection unit,
109, 209 ... Predistorter, 110, 210
... Amplifier, 111,206,211 ... Distributor, 11
5 ... Up-conversion unit, 121-1 ... Attenuation control unit,
121-2 ... Phase control unit, 123 ... Attenuator, 12
4 ... Phase shifter, 128 ... LPF, 129 ... A / D converter, 207 ... Power detector, 208 ... Delay line

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masaki Sudo             3-14-20 Higashi-Nakano, Nakano-ku, Tokyo Stocks             Hitachi Kokusai Electric Co., Ltd. (72) Inventor Tetsuhiko Miyatani             3-14-20 Higashi-Nakano, Nakano-ku, Tokyo Stocks             Hitachi Kokusai Electric Co., Ltd. F term (reference) 5J090 AA01 AA41 CA21 CA87 CA92                       FA19 GN03 GN06 GN07 KA00                       KA15 KA16 KA23 KA32 KA34                       KA42 KA53 KA68 MA11 MA14                       SA14 TA01                 5J500 AA01 AA41 AC21 AC87 AC92                       AF19 AK00 AK15 AK16 AK23                       AK32 AK34 AK42 AK53 AK68                       AM11 AM14 AS14 AT01                 5K004 AA01 AA05 AA08 BA02 FF05                       JF04                 5K022 DD01 DD19                 5K060 BB05 CC04 CC12 DD04 FF07                       HH01 HH06 HH15 HH34 KK06

Claims (3)

[Claims] 1. A quadrature modulator that digitally quadrature modulates an input signal for each carrier and performs offset rotation processing on the digital quadrature modulated signal of each carrier, and a signal that is digital quadrature modulated and offset rotation processed for each carrier. A digital delay unit for digitally delaying the output from the combiner for a certain period of time, a digital / analog converter for converting the digitally delayed signal into an analog signal, and the digital signal converted into the analog signal. Up-conversion means for converting a signal to a radio frequency, power detection means for detecting a power value based on the output from the coupling means, amplification means for amplifying a multi-carrier signal, and part of the output from the amplification means Distribution means for distributing the signal to the multi-carrier signal from the up-conversion means. By using a part of the output from said distribution means and the detected power value by the detection means, amplifying device characterized by comprising a distortion compensation means for providing a distortion compensation for canceling a nonlinear characteristic generated in said amplifying means. 2. A quadrature modulator that digitally quadrature modulates an input signal for each carrier and performs offset rotation processing on the digital quadrature modulated signal of each carrier, and a signal that is digital quadrature modulated and offset rotation processed for each carrier. A combining means for synthesizing, a digital / analog converting means for converting the output from the combining means into an analog signal, an up-converting means for converting the signal converted into the analog signal into a radio frequency, and a combining means from the combining means. A digital delay means for digitally delaying the output for a fixed time; a power detecting means for detecting a power value based on the output from the digital delay means; an amplifying means for amplifying a multicarrier signal; and an output from the amplifying means. Dividing means for dividing a part, and a multi-carrier signal from the up-converting means, An amplifying apparatus comprising: a distortion compensating unit that uses a power value detected by the power detecting unit and a part of the output from the distributing unit to provide distortion compensation that cancels a nonlinear characteristic generated in the amplifying unit. . 3. A base station device in a mobile communication system comprising the amplifier device according to claim 1.